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Lady Scott accepted court reports that Logan has "abnormal personality traits" and features of autism, but said there was no suggestion Logan had a mental disorder and was fully criminally responsible for his actions.

Logan's parents wrote a letter to the court before his sentencing which said they "find it extremely difficult to reconcile the Blair they know with the Blair who caused Cameron's death".

Lady Scott said: "I cannot imagine the pain they will forever endure from what you did, losing in effect both of their sons."